茶芽粗腿象成虫消长动态及其食叶量的研究

目的]明确茶芽粗腿象的防治适期和防治指标。方法]通过对成虫出土进度、死亡进度及食叶量进行研究,提出其防治适期和防治指标。结果]茶芽粗腿象羽化出土时间前后约20 d,在江西婺源始见期为4月初,始盛期为4月上旬末,盛期为4月中旬,盛末期为4月中旬末,末期为4月下旬。茶芽粗腿象成虫的为害期与春茶期吻合,成虫室内取食量大的时期与田间发生为害盛期也是一致的。其成虫的食叶量和寿命个体间差异较大。成虫食叶量平均为202.9 mm2/头。根据该虫食叶量和被害鲜叶的价值,该虫的防治指标定为900头/hm2。结论]为有效防治茶芽粗腿象提供参考。

Study on Growth and Decline Trends and Leaf Consumption of Ochyromera quadrimaculata Adults

Objective] The aim was to definit the optimum control period and index of Ochyromera quadrimaculata.Method] The optimum control period and index were put forward through the study on the unearthed schedule,death schedule and leaf consumption of O.quadrimaculata adults.Result] The unearthed duration of O.quadrimaculata after emergence lasted about 20 days,and its beginning occurrence stage was in initial April,the full incidence beginning period was in the end of first ten days of April and the full incidence period was in the middle of April.The lowest growth period was in the end of middle ten days of April and the end growth period was in the last ten days of April.The damage stage of O.quadrimaculata was consistent with the spring tea stage.The stage of the most feeding amount of O.quadrimaculata adults in laboratory was consistent with the full incidence stage in field.The leaf consumption and life of O.quadrimaculata adults had great difference among the individuals.The average leaf consumption of O.quadrimaculata adults was 202.9 mm2 per adult.The control index of O.quadrimaculata was 900 adults per hm2 according to the leaf consumption of the adult and the value of the damaged fresh leaves.Conclusion] The reference was provided to control O.quadrimaculata effectively.